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US 8,552,646 B2Granted
Low T1I/low InI-based dose for dimming with minimal color shift and high performance
AssigneeGeneral Electric Company
InventorsLei Deng, Thomas Joseph Coffey
Life of this patent
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Abstract
The present disclosure relates to a discharge lamp able to be operated at less than full rated power without suffering undesirable color shift, loss of lumen maintenance or loss of lamp efficacy. It finds particular application in connection with ceramic metal halide lamps having a low dose level of thallium iodide and optionally indium iodide, e.g. less than 1 mol %, in the dose thereof.
Claims20
A lamp comprising:
- a discharge vessel;
- electrodes operatively associated with the discharge vessel;
- and
- an ionizable fill sealed within the vessel, wherein the fill includes:
- (a) an inert gas,
- (b) mercury,
- (c) less than or equal to 0.4 mol % thallium halide, and
- (d) a further halide component including:
- (i) an alkali metal halide,
- (ii) an alkaline earth metal halide, and
- (iii) at least one of a rare earth halide selected from the group consisting of lanthanum and cerium, and optionally praseodyimium, europium, neodymium, and samarium, and combinations thereof.
8 more elements
A method of forming a lamp, comprising:
- providing a discharge vessel;
- sealing an ionizing fill within the vessel, wherein the fill includes:
- (a) an inert gas,
- (b) mercury,
- (c) less than or equal to 0.4 mol % thallium halide and optionally less than 1 mol % indium halide, and
- (d) a further halide component including:
- (i) an alkali metal halide,
- (ii) an alkaline earth metal halide, and
- (iii) at least one of a rare earth halide selected from the group consisting of lanthanum and cerium, and optionally praseodymium, europium, neodymium, and samarium, and combinations thereof;
- and
- positioning electrodes within the discharge vessel to energize the fill in response to a voltage applied thereto,
- wherein the lamp, when operated at less than 50% of its nominal lamp power, exhibits an MPCD of less than 6.
9 more elements
Dependencies are inferred from the claim text.